Measure 360 and Hold Data Protractor measuring range: 0-999.9; Resolution: 0.05(3'); Accuracy: 0.5; The goniometer, can measure 360inner and outer angles, supports degree and degree/minute unit conversion. It has hold button and zero button. To lock the data, please press the HOLD button. (Turning the knob is only for loosening and tightening, can not fully fix the angle 4 in 1 Multifunctional Digital Goniometer: This product is a combination of protractor, level to bubble,circular spirit level and ruler.It is calibrated by 3 spirit levels.Help you measure the angle better.(NOTE: This is NOT a digital level, there is no number displayed on the LCD display, can only judge whether the object is tilted).The main ruler is double scale in metric and inch. Large LCD display and automatic shut-off: This protractor has a large full-screen LCD display that allows you to read data easily and quickly The digital angle ruler automatically turns off after 5 minutes of inactivity to save power The digital protractor also has a zero button that can be reset to any position and is suitable for absolute and relative measurement. High Quality Material and Portable Design: The thickened and widened ruler body is made of high quality material. high strength nylon fiberglass construction, which has good hardness, wear resistance, no deformation, no scratches, lightweight and durable 230mm, small, delicate design, easy to use and carry. Hanging hole design is convenient for hanging. Wide Range of Applications: This angle measuring tool is widely used in carpentry furniture, building decorations, school , home renovation, mechanical processing and other fields (including angle adjustment of table saws, miter saws, band saws, etc.) Package Contents] 1 Viewfinder digital angle, 1 CR2032 3V battery, 1 instruction manual. Passed CE and FC certification. Features: Allow 360 degree measurement Internal and external angle With horizontal bubble / Vertical bubble / circular spirit level Main ruler with metric and inch scale lines Large easy-to-read LCD display Data hold function to hold the necessary angle value Zero button for absolute and relative measurement Degree/degree-minute unit conversion to meet different requirements Auto shut-off after 5 minutes to extend battery life Hanging hole is convenient for hanging and storing Multi-functional combination - it can be a Angle Finder and Level, Angle Ruler, Straight Ruler Package includes: 1x Goniometer digital 1xCR2032 battery 1x instruction manual